Inductance coil



July 2, 1935. M, QSNOS 2,006,406

INDUCTANCE COIL Filed Aug. 2, 1935 INVENTOR MEN DEL OSNOS ATTORNEY 39 of the coil is somewhat greater than the inside Patented July 2,1935 2,006,406.

UNITED STATES PATENT OFFICE awaits mnncmncn con.

Mendel Osnos, Berlin, Germany, assignor to Telefunken Gesellschaft fur Drahtlose Telegraphic m. b. 11., Berlin, Germany, a corporation of Germany Application August 2, 1933, Serial No. 683,240 In Germany August 15, 1932 6 Claims. (CLUE-359) This invention relates to an inductance coil D==Do(l+a1t) with variable or regulable or partly or wholly (2) eliminable temperature dependency. H: Um (l+azt) T invention consists in that the inductance where a is the heat ex ansion coefiicient of 5 con 3 externally bounded by another body or quartz efncl 042 the heat ezfpansion coefiicient of combination of bodies in such a fashion that in copper While Do and U0 respectively are th the presence of temperature fluctuations the divaluesof D and U fo degrees C t we ameter of the coil is able to change only in 2.0- may write also cordance with the temperature coefl'icient of expension of the boundary body or combination of L: M E9 bodies, in other words, independently of the thermal expansion coeificient of the coil material, the where Lo t value f the inductance at 13:0, or axial length of the inductance coil, however, varyelse, Since a2 is very mall compared with unity mg as a. function of the last-mentionedcoefli- 15 went. V IL=L0 l i-3011f (4) E This invention will be more clearly understood H'azt by referring to the accompanying drawing in tt P a1: 1/30.:z2,

Flg. 1 shows a sectional view of an improved then 2 inductance coil;

Fig. 2 shows a sectional view of another modi- I (5) fication offan improved inductance coil. 1 Hazt Referring now to Fig. 1, i denotes a cylinde hence made from material such as quartz whose 00- L L 5 eiiicient of expansion is very low (for example,

1/30th that of copper), while 2 denotes a mark- Q according to e Object of this edly elastic copper spiral, the outside diameter Y as i by i indumma is of which is reducible by the turning of the coil; to made adluswfble reguable if n or In free or normal state, the outside diameter deslred part of the 6011 may be towed mm it is then feasible to regulate ad libitum the dedlameter of the quartz cylinder. Twisting the pendence 0f the inductance coil upon the coil somewhat together it will be possible to forcepemtm-a fit it into the cylinder so that it will firmly be If glass i employed as the cylinder mate a quartz cylinder. By the shifting of the cylinder 3 pressed upon and engage with the internal S e instead of quartz, then the effect of the cylinder wall of the cylinder. Hence, the outside diawill be lower in proportion to the lower expan- 'meter of the spiral is always governed by the .sion coefiloient of glass.

inside diameter of the quartz cylinder. The axial In some instances it may be desirable to artilength of the spiral, however, is capable of unficially increase'the dependence of quantity L 40 restrained adjustment according to the temupon the temperature, for instance, when the perature. inductance connected in parallel to a capacity If the ratio between diameter D of the spiral determines the wave a transmitter, d if the and the circumference 0 of its winding is becondenser is built so that its size decreases very tween 1 and 3, then the inductance thereof'will markedly with the p 'a l In this 6588 be approximately the preferable plan will be to make the ;cylinder 45 4 01' a. kind of material whose coeflicient of expan- ,/1 (I) sion is greater than that of copper, say, ebonite.

U I claim: 1. An inductance coil comprising a quartz cyl- See 3 1 .;g gi ga fi i g t fi g inder, a metallic spiral coil having an outside 50 r pge w ere equa 5 diameter slightly greater than the inside diamethe total number of tmjnsi D equals the average ter of said quartz cylinder, said spiral coil endiameter, U=2:c(l+ b), 1f 1 and b are respectiv gaging the internal wall of said quartz cylinder the length and thickness of the coil in centiso as to firmly retain said coil within said meters). And since inder. 55

2/An inductance coil comprising a quartz cylinder, a metallic spiral inductance coil engaging the internal wall of said quartz cylinder so as'to firmly retain said coil within said cylinder.

3. An inductance coil comprising a quartz cylinder, a spiral inductance coil whose ax al length of spiral is' capable of unrestrained adjustment according to the temperature, said inductance coil being retained'within said quartz cylinder;

4. An inductance coil comprising a quartz cylinder having at least one of its ends flared out to a slightly larger diameter, a metallic spiral coil having an outside diameter slightly greater than the inside diameter oi. said quartz cylinder so as to firmly retain said coil within said cylinder.

5. An inductance coil comprising a quartz cylinder, a copper spiral coil having an outside diameter slightly greater than the inside diameter of said quartz cylinder, said copper spiral coil engaging the inner wall oi said quartz cylinder so as to firmly retain said coil within said cylinder.

6. An inductance coil comprising a quartz cylinder having at least one oi. its ends flared out to a slightly larger diameter, a metallic inductance coil having an outside diameter slightly greater than the inside diameter of said quartz cylinder so as to firmly retain said coil within said-cylinder, said inductance coil being movable within said cylinder. v

MENDEL OSNOS 

